<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
    <input type="text" >
    <input type="text" >
    <input type="button" value="加" >
    <input type="button" value="减" >
    <input type="button" value="乘" >
    <input type="button" value="除" >
    <div></div>
</div>
</body>
</html>